10C
General Troubleshooting of Immobilizer Control System
This troubleshooting has to performed in case that any DTC is not detected by Immobilizer Control Module and the engine cannot be started up.
Possible Causes
• Open or short circuit in communication line between Immobilizer Control Module and ECM
• Related fuse(s) blown
• Ground circuit for coil antenna faulty
• Power circuit for Immobilizer Control Module faulty
• Ground circuit for Immobilizer Control Module faulty
• Poor connection at Immobilizer Control Module connector
• Poor connection at ECM connector
• Internal fault of Immobilizer Control Module
• Internal fault of ECM
Troubleshooting
Step Action YES NO
1
Does Immobilizer Control System Check:K9K Model performed?
Go to Step 2.
Perform Immobilizer Control System Check:K9K Model .
2
Fuse Check
1) Check if any related fuse is blown.
Is any fuse blown?
Replace blown fuse(s) with new one(s).
Go to Step 3.
3
Check for poor connection of communication line between Immobilizer Control Module and ECM
1) Disconnect Immobilizer Control Module connector referring to Immobilizer Control Module Removal and Installation:K9K Model .
2) Disconnect ECM connectors referring to Engine Control Module (ECM) Removal and Installation:K9K .
3) Check if wire connections are normal at “G46-15” wire terminal at Immobilizer Control Module connector and “E17-25” wire terminal at ECM connector.
Is each wire connection normal?
Go to Step 4.
Repair poor connection(s).
4
Check for short to power circuit in communication line between Immobilizer Control Module and ECM
1) Connect Immobilizer Control Module and ECM connectors.
2) With ignition switch at ON position, check voltage between “E17-25” wire terminal at ECM connector and body ground.
Is it about 12 V?
Repair short to power circuit in communication line between Immobilizer Control Module and ECM.
Go to Step 5.
5
Check for short to ground circuit in communication line between Immobilizer Control Module and ECM
1) Disconnect Immobilizer Control Module and ECM connectors.
2) Check resistance between “G46-15” wire terminal at Immobilizer Control Module connector and body ground.
Is resistance more than 1 MΩ?
Go to Step 6.
Repair short to ground circuit in communication line between Immobilizer Control Module and ECM.
6
Check for power circuit for coil antenna
1) With ignition switch at ON position, check voltage between “G47-4” wire terminal at coil antenna connector and body ground.
Is it about 12 V
Go to Step 7.
Repair open in power circuit.
7
Check for power circuit for Immobilizer Control Module
1) With ignition switch at ON position, check voltage between “G46-18” wire terminal at Immobilizer Control Module connector and body ground.
Is it about 12 V?
Go to Step 8.
Repair open in ground circuit, and then start engine.
If engine does not start, go to Step 9.
8
Check for ground circuit for Immobilizer Control Module
1) With ignition switch at ON position, check voltage between “G46-17” wire terminal at Immobilizer Control Module connector and body ground.
Is it 0 V?
Go to Step 9.
Repair open in ground circuit.
9
Check for ground circuit for Immobilizer Control Module
1) Check resistance between “G46-15” wire terminal at Immobilizer Control Module connector and “E17-25” wire terminal at ECM connector.
Is resistance infinite?
Repair open in communication line between Immobilizer Control Module and ECM.
Go to Step 10.
10
Check for fault of Immobilizer Control Module
1) Perform voltage check referring to Inspection of Immobilizer Control Module and Its Circuit:K9K Model .
Is each terminal voltage normal?
Perform “Procedure for ECM Replacement” in Registration Procedure of Immobilizer Control System Components:K9K Model .
Replace Immobilizer Control Module with new one referring to Immobilizer Control Module Removal and Installation:K9K Model . And then, perform key registration referring to “Procedure after Immobilizer Control Module Replacement in Registration Procedure of Immobilizer Control System Components:K9K Model .